Heading for c4-e3-d5 in order to exploit the key square d5.

1...Nd5? 2.Nxd5 exd5 would be a strategical error, since the d5-square could no longer be used by the pieces.

Now that ...d6-d5 can no longer be arranged, it is difficult for Black to find an active plan.

There is no hurry to occupy d5. Geller first reinforces his queenside.

Thanks to his great knight, White has a clear advantage.

Preparing the exchange of the main defender of the e4-square, the knight on c3.

2.a3 Bxc3 3.Bxc3 Ne7 -/+

From here the knight can join the battle for the e4-square via d6 or even g3.

Intending Rc2 with an overwhelming advantage.

Heading for the protected square on e5.